Compilare: user.cpp: In function ‘int cmlsc(std::string, std::string)’: user.cpp:25:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=a.size();i++) ^ user.cpp:26:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=1;j<=b.size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:58:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<S.size();i++) ^ user.cpp:70:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<S.size();i++) ^